This is the Star Fleet Logo from Star Trek the Motion Picture movie, it was worn by officers and enlisted with command training until a new insignia was designed for officers leaving this insignia only worn by enlisted and non-Star Fleet crew members. 

If you place this STL in your slicing software, it should be 42mm X 35mm X 3mm.

It should use 2g of material without build plate adhesion, 3g with brim and 4 with a raft and take between 34 to 45 min to print at 20mm/s print speed on fine print settings (0.1-layer height).